Move on over to the Universal Render Pipeline with our advanced guide

Now available: A free new e-book for experienced Unity developers and technical artists to take on the Universal Render Pipeline (URP)

By supporting over 20 platforms, we want you to reach as many players as possible – and with the Built-in Render Pipeline, we strive to provide a strong mix of graphics features across different hardware. However, certain limitations have become apparent over time, as the number of platforms supported by Unity has grown significantly. 

Unity’s two Scriptable Render Pipelines (SRPs), the High Definition Render Pipeline (HDRP) and the Universal Render Pipeline (URP) are robust, long-term solutions for meeting the ever-evolving rendering requirements for multiplatform development. With these SRPs, you can efficiently customize the culling of objects, their drawing, and the post-processing of the frame without having to use low-level programming languages like C++. They also support authoring tools like Visual Effects Graph and Shader Graph.

Source: Unity Technologies Blog